Item 19 - Agreement for Pavement Managment Program Update

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o' CT,; &GO Countywide Pavement Management Plan Guidelines Local Tax Dollars at Work The sample unit selected must be representative of the entire pavement section. This assumes that the section is homogenous; if it is not homogeneous, then the section must be split according to the criteria agreed upon by the agency. Typically, the criteria used are: • Pavement condition • Construction age, if known • Maintenance history, if known • Traffic volumes (or functional classification as a surrogate) • Surface types (e.g. asphalt concrete or Portland cement concrete) • Geometric elements (e.g. widths) Any modifications to the section inventory data are documented in the pavement management report. A sample unit must be between 2,500 ± 1,000 square feet in conformance with ASTM D6433 protocols. Typical sample unit dimensions are 100 feet long by the width of the street. Streets that are wider than 40 feet wide will have shorter lengths (generally 50 feet) or if they are divided by a raised median, separate sample units will be taken in each direction. Any pavement areas that are not representative of the section will be noted and surveyed as an additional sample unit. Accuracy Required for Data Collection The accuracy required for data collection has two components, both of which are further described in the following paragraphs. • Re -inspections • PCI comparisons with past surveys Random and Systematic Re -Inspections Random Re -inspections Random re -inspections will include a representative selection across the following categories: • Functional classes (i.e. MPAH, locals); • Surface types (e.g. asphalt concrete or Portland cement concrete); • Pavement conditions (e.g. good, fair, poor); • Inspectors; • Geographical areas, if applicable. Systematic Re -inspections For systematic re -inspections, this could be due to noticed trends such as specific treatment types (e.g. open -graded mixes), a specific inspector or geographical area. In such cases, more than 5% will be re- inspected. Effective March 2024 A-19